<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>





    <script>
        class Person {
            constructor(name, age) {
                this.name = name;
                this.age = age;
            }
            talk() {
                console.log('嘿嘿');
            }
        }

        class Student extends Person {
            constructor(name, age, score) {
                super(name, age);
                this.score = score;
            }
            talk() {
                console.log(`我是${this.name}${this.age}${this.score}`);
            }
        }
        let obj = new Student('zhangsan', 18, 10);
        obj.talk();
    </script>
</body>

</html>